Full Dynamic Analysis of Offshore Platform Structures Using Exact Timoshenko Pipe Element

Abstract

One of the major divisions in the mathematical modeling of a tubular structure is to include the effect of the transverse shear stress and rotary inertia in vibration of members. During the past three decades, problems of vibration of tubular structures have been considered by some authors, and special attention has been devoted to the Timoshenko theory. There have been considerable efforts, also, to apply the method of spectral analysis to vibration of a structure with tubular section beams. The purpose of this paper is to compare the results of the improved complex spectral element method for the Timoshenko theory with those derived from the conventional finite element method for an offshore structure. Using a computer program, the proposed formulation has been extended to derive the dynamic response of an offshore platform structure under dynamic loads.

Guided-wave-based structural health monitoring of built-up composite structures using spectral finite element method

“…( ipt = [6,7,8,9,10], 11,12,13,14,15] (17) The stiffened structure shown in Fig. 3 is modeled by assembling spectral plate elements, 1-2, 2-3, and 2-4 and the global stiffness matrix is of the order 20 × 20.…”

Dynamic response of offshore jacket platform including foundation degradation under cyclic loadings

“…In their calculation an equivalent simplified stick model was used. Some researchers calculated the natural frequencies and mode shapes of offshore structures in time domain with modal analysis (Karunakaran et al, 1997) or used exact Timoshenko pipe elements to determine the dynamic response of an offshore platform in the frequency domain (Horr and Safi, 2003). Ou et al (2007) developed a damping isolation system to control the vibration of a steel jacket offshore platform.…”

Dynamic response of offshore jacket structures under random loads

“…The method provides approximate and quick way for estimating the platform's response to wave loading. Horr and Safi [9] used exact Timoshenko pipe elements to determine the dynamic response of an offshore platform in the frequency domain. Mostafa and El Naggar [14] studied the response of fixed offshore platforms supported by clusters of piles.…”